package com.garygyp.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.garygyp.eduservice.entity.EduSubject;
import com.garygyp.eduservice.entity.excel.SubjectData;
import com.garygyp.eduservice.service.EduSubjectService;
import com.garygyp.servicebase.exceptionhandler.GuliException;

/**
 * @author GaryGyp
 * @date 2022/5/10 22:44
 * @description
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    // 因为SubjectExcelListener不能交给spring进行管理，需要自己new，所以不能注入其他对象
    // 不能实现数据库操作

    public EduSubjectService subjectService;

    public SubjectExcelListener() {}

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    // 读取excel中的内容，一行一行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }

        // 一行一行读取，每次读取都是两个值，第一个值是一级分类，第二个值是二级分类
        // 判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject == null) {
            // 没有相同的一级分类，进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            // 一级分类名称
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }

        // 获取一级分类的id值
        String pid = existOneSubject.getId();
        // 添加二级分类
        // 判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (existTwoSubject == null) {
            // 没有相同的二级分类，进行添加
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            // 二级分类名称
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(existTwoSubject);
        }
    }

    /**
     * 判断一级分类不能重复添加（查看表里面是否有相通的一级分类）
     * @param subjectService
     * @param name 一级分类的类名
     * @return
     */
    private EduSubject existOneSubject(EduSubjectService subjectService, String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", "0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    // 判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name, String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
    }
}
